Adaptive query compilation in graph databases

Author:

Baumstark Alexander,Jibril Muhammad Attahir,Sattler Kai-Uwe

Abstract

AbstractCompiling database queries into compact and efficient machine code has proven to be a great technique to improve query performance and exploit characteristics of modern hardware. Particularly for graph database queries, which often execute the exact instructions for processing, this technique can lead to an improvement. Furthermore, compilation frameworks like LLVM provide powerful optimization techniques and support different backends. However, the time for generating and optimizing machine code becomes an issue for short-running queries or queries which could produce early results quickly. In this work, we present an adaptive approach integrating graph query interpretation and compilation. While query compilation and code generation are running in the background, the query execution starts using the interpreter. When the code generation is finished, the execution switches to the compiled code. Our evaluation of the approach using short-running and complex queries show that autonomously switching execution modes helps to improve the runtime of all types of queries and additionally to hide compilation times and the additional latencies of the underlying storage.

Funder

Deutsche Forschungsgemeinschaft

Carl-Zeiss-Stiftung

Technische Universität Ilmenau

Publisher

Springer Science and Business Media LLC

Subject

Information Systems and Management,Hardware and Architecture,Information Systems,Software

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